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Mary Avenue Overcrossing

The Mary Avenue Overcrossing project aims to relieve north-south traffic congestion in Sunnyvale, improve multimodal access between Moffett Park and other areas, and support smart growth in Moffett Park area.

The project would provide a multimodal connection from Mary and Almanor avenues, over US-101, SR-237 and Moffett Park LRT Station to 11th Avenue and Discovery Way (formerly E Street) in Moffett Park.

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Dennis Ng, Transportation and Traffic Manager, 408-730-7591


The project team is developing a recommendation to City Council. The recommendation is for the selection of the preferred alternative for the environmental process.


2020 - September to December, Selection of Preferred Alternative for the Environmental Impact Report (EIR)

2021 - January to November, Preparation of Draft EIR and Final EIR

2021 - December, Approval of EIR and Selection of Project Alternative


Map of location

As part of the EIR, we are analyzing the following project options:

  1. Four lanes of motor vehicle travel with sidewalks and protected bicycle facilities
  2. Two lanes of motor vehicle travel with sidewalks and protected bicycle facilities
  3. Two lanes for transit, shuttle and high-occupancy vehicles with sidewalks and protected bicycle facilities
  4. Pedestrian and bicycle overcrossing
  5. Removal of the overcrossing from the General Plan


Mary Avenue Overcrossing was included in the following City of Sunnyvale plans:

  • 1972 City of Sunnyvale General Plan
  • 1981 Transportation Element
  • 1997 Land Use and Transportation Element
  • 2004 Moffett Park Specific Plan
  • 2005 Traffic Impact Fee
  • 2011 Consolidated General Plan
  • 2013 Moffett Park Specific Plan Update
  • 2016 Peery Park Specific Plan

In 2007, the City of Sunnyvale completed a Draft Environmental Impact Report (EIR) for Mary Avenue Extension. Many members of the community provided comments on the Draft EIR. Key concerns related to traffic congestion, traffic speed, pedestrian and bicyclist safety, air pollution and emissions, noise, property values, smart growth, transit access, and merchant revenues.

Responses were provided to community comments, and City Council certified the Final EIR and approved the Mary Avenue Extension project in October 2008. In 2009, the Sunnyvale West Neighborhood Association filed a legal challenge against the City regarding the adequacy of the EIR document based on the use of a 2020 traffic baseline for the traffic analysis. The Superior Court granted the petition in 2009, and the 6th District Court of Appeal upheld the Superior Court decision in 2010. City Council subsequently decertified the EIR and voided the project approval in 2011. Without an adequate EIR, no action has occurred on the project since that time.

The 2011 Consolidated General Plan included a policy to preserve the option of extending Mary Avenue to the industrial areas north of US-101. Mary Avenue Extension was also included in the Moffett Park and Peery Park Specific Plans, as well as several other documents which identified the project as a mitigation measure for impacts on automobile level of service (LOS).

Last Updated: Oct 28, 2020